}
static int _donation_value(int value)
{
    return ((value * log((double)value)) / MAX_PIETY);

        const int donation_value =
            (int)(you.gold / MAX_PIETY * log((double)you.gold));

        const int donation = _donation_value(you.gold);

             "increase of piety by %d.", you.gold, donation_value);

             "increase of piety by %d.", you.gold, donation);

        if (donation_value < 1)

        if (donation < 1)

        you.duration[DUR_PIETY_POOL] += donation_value;

        you.duration[DUR_PIETY_POOL] += donation;

            std::min(MAX_PIETY + MAX_PENANCE,

            std::min(MAX_PENANCE + MAX_PIETY,

        if (donation_value >= 30 && you.piety <= 170)
            result += "!";
        else
            result += ".";

        result += (donation >= 30 && you.piety <= 170) ? "!" : ".";